I see comb built like this on top of my deeps if I leave my shims on top of the brood box too long in the spring. To solve the problem, when I see comb starting to be made like this, I put an inner cover on the brood box with a shim on top of the inner cover. ( you can top it all off with another moisture board or inner cover, or just put the top cover on.) I put my fondont and pollen patties on top of the inner cover. The bees will crawl through the center hole and access the food and not make comb because they do not consider the area above the inner cover part of their home. This can only be done when it is warm enough for the bees to break cluster to eat. The trick is to check a lot in the spring to make sure your bees do not build comb where it doesn't belong!
